Labeled MIBG imaging is a potential test for determining of the integrity of the individual autonomic function. Reduced MIBG uptake indicates postganglionic sympathetic dysfunction, which has been observed during the early stages of PD. MIBG scintigraphy is thought to be a sensitive modality for the diagnosis of PD, assisting in the differential diagnosis of other parkinsonian diseases, PD and other movement disorders. This method has also been reported to be of a high specificity.